764 

WGHW50 PHFO 201743

FFWHFO

HIC003-202100-

/O.EXT.PHFO.FF.W.0017.000000T0000Z-260320T2100Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/



BULLETIN - EAS ACTIVATION REQUESTED

Flash Flood Warning

National Weather Service Honolulu HI

743 AM HST Fri Mar 20 2026



...FLASH FLOOD EMERGENCY FOR NORTHERN OAHU...



The National Weather Service in Honolulu has extended the



* Flash Flood Warning for...

  The island of Oahu in Honolulu County



* Until 1100 AM HST.



* At 743 AM HST, emergency management reported widespread 

  life-threatening flash flooding effects continuing across northern 

  Oahu, particularly in the Haleiwa and Waialua areas. Although 

  rainfall rates have temporarily decreased, significant runoff 

  continues to produce high water levels, including the Wahiawa 

  Reservoir which continues to rise.



Additional bands of heavy rainfall moving in from the southwest will 

continue over the area throughout the day, which could lead to 

renewed rises in water levels and worsening flooding conditions.



The Wahiawa Reservoir (Lake Wilson) remains elevated, with water 

levels continuing to rise from runoff, despite a break in the heavy 

rainfall. Additional rises in this reservoir could further 

exacerbate downstream flooding along the streams, particularly near 

Otake Camp in Waialua.



For the windward side of Oahu, periods of heavy showers will 

continue to develop and move through, with rainfall rates of 1 to 2 

inches per hour. Water levels in the streams remain high, especially 

in the Waiahole, Waikane, and Kahana streams. Runoff impacting 

vulnerable low lying areas and roads will continue through the 

morning hours.



  This is a FLASH FLOOD EMERGENCY for Northern Oahu. This is a 

  PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!



  HAZARD...Heavy rain producing life threatening flash flooding.



  SOURCE...Stream Gauges.



  IMPACT...Severe flooding in drainages, streams, rivers, roads,

           properties, and other low lying areas. Numerous public

           road closures expected, as well as landslides in steep

           terrain. Significant property damage expected to homes

           and other properties in low lying areas.



* Some locations that will experience flash flooding include...

  northern half of Oahu, along and north of a line from Waianae 

  Valley to Mililani Mauka to Waiahole.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Move to higher ground now! This is an extremely dangerous and 

life-threatening situation. Do not attempt to travel unless you are 

fleeing an area subject to flooding or under an evacuation order.



Stay away from streams, rivers, drainage ditches, and culverts, even 

if they are currently dry.



The heavy rains may cause rock and mudslides in steep terrain areas.



&&



This warning may need to be extended beyond 1100 AM HST if flooding 

persists.



LAT...LON 2148 15824 2153 15825 2157 15829 2158 15829

      2159 15828 2160 15813 2169 15805 2173 15798

      2155 15783 2150 15783 2140 15818



FLASH FLOOD...GAUGE INDICATED

FLASH FLOOD DAMAGE THREAT...CATASTROPHIC



$$



TS